Holographic 3D recording device, reproducing device and display apparatus

Patent metadata

Field	Value
Publication number	US-9964924-B2
Application number	US-201515122307-A
Country	US
Kind code	B2
Filing date	Aug 28, 2015
Priority date	Mar 27, 2015
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

A holographic 3D recording device includes: a photorefractive crystal and a microlens array. The microlens array includes an array face and a side face. The microlens array is provided in a light path from an object to be photographed to the photorefractive crystal such that first light of object emitted through a diffuse reflection of the object to be photographed passes through the array face of the microlens array and becomes second light of object that is emitted to the photorefractive crystal. The photorefractive crystal is configured to receive the second light of object emitted by the microlens array and reference light, respectively, and save therein an interference fringe formed by the reference light and the second light of object. The first light of object and the reference light are coherent light.

First claim

What is claimed is:

1. A holographic 3D recording device, comprising: a photorefractive crystal and a microlens array, wherein
the microlens array comprises an array face and a side face;
the microlens array is provided in a light path from an object to be photographed to the photorefractive crystal, such that first light of object emitted through a diffuse reflection of the object to be photographed passes through the array face of the microlens array and becomes second light of object that is emitted to the photorefractive crystal; and
the photorefractive crystal is configured to receive the second light of object emitted by the microlens array and reference light respectively, and save therein an interference fringe formed by the reference light and the second light of object;
the first light of object and the reference light are coherent light.

2. The holographic 3D recording device of claim 1 , wherein, an area of a light receiving face of the photorefractive crystal is less than an area of the array face of the microlens array.

3. The holographic 3D recording device of claim 2 , further comprising a focusing unit provided in a light path from the microlens array to the photorefractive crystal and configured to receive the second light of object emitted by the microlens array and converge the second light of object emitted by the microlens array onto the photorefractive crystal.

4. The holographic 3D recording device of claim 1 , further comprising a beam splitting unit configured to implement a beam splitting on a laser beam to form and emit the reference light and third light of object; wherein, the reference light is emitted to the photorefractive crystal while the third light of object is emitted to the object to be photographed.

5. The holographic 3D recording device of claim 4 , further comprising a laser generating unit configured to generate the laser beam and emit the laser beam to the beam splitting unit.

6. The holographic 3D recording device of claim 5 , further comprising a beam expansion and collimation unit provided in a light path from the laser generating unit to the beam splitting unit and configured to receive the laser beam emitted by the laser generating unit and emit, after implementing beam expansion and collimation on the laser beam emitted by the laser generating unit, the laser beam to the beam splitting unit.

7. The holographic 3D recording device of claim 6 , further comprising a first reflecting mirror provided in a light path from the beam splitting unit to the photorefractive crystal and configured to reflect the reference light emitted by the beam splitting unit to the photorefractive crystal.

8. The holographic 3D recording device of claim 7 , further comprising a second reflecting mirror provided in a light path from the beam splitting unit to the object to be photographed and configured to reflect the third light of object emitted by the beam splitting unit to the object to be photographed.

9. A holographic 3D reproducing device, comprising a photorefractive crystal and a microlens array, wherein
the microlens array comprises an array face and a side face;
the photorefractive crystal is configured to receive reference light such that the reference light diffracts with an interference fringe saved in the photorefractive crystal to form a reproducing light wave, that is emitted to the microlens array, of a holographic 3D image corresponding to the interference fringe, wherein, an area of a light outgoing face of the photorefractive crystal is less than an area of the array face of the microlens array; and
the microlens array is configured to receive the reproducing light wave emitted by the photorefractive crystal such that the reproducing light wave passes through the array face of the microlens array to reproduce the holographic 3D image.

10. The holographic 3D reproducing device of claim 9 , further comprising a beam splitting unit configured to implement a beam splitting on a laser beam to form and emit reference light and third light of object; wherein, the reference light is emitted to the photorefractive crystal.

11. The holographic 3D reproducing device of claim 10 , further comprising a laser generating unit configured to generate the laser beam and emit the laser beam to the beam splitting unit.

12. The holographic 3D reproducing device of claim 11 , further comprising a beam expansion and collimation unit provided in a light path from the laser generating unit to the beam splitting unit and configured to receive the laser beam emitted by the laser generating unit and emit, after implementing beam expansion and collimation on the laser beam emitted by the laser generating unit, the laser beam to the beam splitting unit.

13. The holographic 3D reproducing device of claim 10 , further comprising a half-wave plate provided in a light path from the beam splitting unit to the photorefractive crystal and configured to receive the reference light emitted by the beam splitting unit, convert the reference light emitted by the beam splitting unit into phase conjugated light, and emit the phase conjugated light to the photorefractive crystal.

14. The holographic 3D recording device of claim 13 , further comprising a diverging unit provided in a light path from the photorefractive crystal to the microlens array and configured to receive the reproducing light wave emitted by the photorefractive crystal and diverge the reproducing light wave emitted by the photorefractive crystal onto the microlens array.

15. The holographic 3D recording device of claim 14 , further comprising an object light baffle plate provided in a light outgoing path of the third light of object and configured to shield the third light of object.

16. The holographic 3D recording device of claim 15 , further comprising a third reflecting mirror provided in the light path from the beam splitting unit to the photorefractive crystal and configured to reflect the reference light emitted by the beam splitting unit to the photorefractive crystal.

17. The holographic 3D recording device of claim 16 , further comprising a diffuser sheet provided in a light path from the diverging unit to the microlens array and configured to receive the light wave emitted by the diverging unit and emit the light wave emitted by the diverging unit to the microlens array.

18. The holographic 3D recording device of claim 17 , further comprising a polarization sheet provided in a light path from the photorefractive crystal to the diverging unit and configured to receive the reproducing light wave emitted by the photorefractive crystal and emit the reproducing light wave emitted by the photorefractive crystal to the diverging unit.

19. A holographic 3D display apparatus, comprising: a photorefractive crystal and a microlens array; wherein
the microlens array comprises an array face and a side face;
in the case that the display apparatus is used for implementing a holographic 3D record, the microlens array is provided in a light path from an object to be photographed to the photorefractive crystal such that first light of object emitted through diffuse reflection of the object to be photographed passes through the array face of the microlens array and becomes second light of object that is emitted to the photorefractive crystal; the photorefractive crystal is configured to receive the second light of object emitted by the microlens array and reference light respectively, and save therein an interference fringe formed by the reference light and the second light of object; an

Assignees

• Boe Technology Group Co Ltd
• Beijing Boe Chatani Electronics Co Ltd

Inventors

• Meng Yingli

Classifications

• G03H2223/20

  Birefringent optical element, e.g. wave plate · CPC title

• G03H2001/0268

  Inorganic recording material, e.g. photorefractive crystal [PRC] · CPC title

• G03H1/02

  Details {of features involved during the holographic process; Replication of holograms without interference recording} · CPC title

• G03H2210/30

  3D object · CPC title

• G03H2222/53

  Collimated beam · CPC title